La Colosa mine

The La Colosa Au porphyry gold in Colombia.[1] The is located in Cajamarca, Tolima on the eastern flanks of the Central Ranges of the Colombian Andes. La Colosa has estimated inferred resources of 24,000,000 ounces (680 t) of gold, grading at 0.9 to 1.0 milligram per kilogram (1.4×10−5 to 1.6×10−5 oz/lb) of Au.[1] In 2015, the mine produced 1,810.35 grams (63.858 oz) of gold.[2] In 2016, 88.4% of the mining value in Colombia came from coal and gold combined, with nickel following at 9.3%.[3]

La Colosa
Location
La Colosa
Location of La Colosa in Colombia
LocationCajamarca
DepartmentTolima
CountryColombia
Coordinates 4.4167°N 75.5000°W / 4.4167; -75.5000
Production
ProductsGold
Production1,810.35 g (63.858 oz)
Financial year2015
History
Opened2006
Owner
CompanyAngloGold Ashanti

Description

La Colosa, covering an area of 600 square kilometres (230 sq mi), is the second major greenfield discovery in Colombia, after Gramalote and believed to have a potential of producing between 800,000 to 1,200,000 ounces (23 to 34 t) of gold per year for 20 years. La Colosa gold project, started in 2006, is based on low-grade porphyry copper deposits containing a small amount of gold. Gold grains in the deposit are found both liberated and locked in sulphides and silicates.[1] The gold mineralization in the deposit is attributed to porphyry intrusions into the Paleozoic schists of the Cajamarca Complex on the eastern flank of the Central Ranges of the Colombian Andes,[4] around 8 Ma. Gold mineralization is believed to have occurred over three early phases of intrusion, which are accompanied by a series of potassic and sodic-calcic alteration events and a late phase of dacite porphyry intrusions.[1]

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See also

References
  1. Mining Technology - La Colosa
  2. Gold - UPME
  3. "Mining value data 2016". Archived from the original on 2018-06-14. Retrieved 2018-05-31.
  4. Arango Mendoza, 2014, p.72

Bibliography

Maps
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